Inorganic light-emitting diode display

ABSTRACT

An inorganic light-emitting device is provided. The inorganic light-emitting device includes a carrier; a plurality of green chips, a plurality of red chips, and a plurality of blue chips periodically arranged on the carrier. The number of green chips is greater than the number of red chips, and the number of green chips is greater than the number of blue chips. A minimum distance Psub_g between adjacent ones of the green chips is smaller than a minimum distance Psub_r between adjacent ones of the red chips in a first direction D1, and the minimum distance Psub_g between adjacent ones of the green chips is smaller than a minimum distance Psub_b between adjacent ones of the blue chips in the first direction D1.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of Taiwan Patent Application No.111101057 filed on Jan. 11, 2022, the entirety of which is incorporatedby reference herein.

BACKGROUND Technical Field

The present disclosure relates to inorganic light-emitting diodedisplays, and in particular, to sub-pixel arrangement structures ofinorganic light-emitting diode displays.

Description of the Related Art

With the ongoing development of display technology, the market currentlydemands high-performance display panels so they are moving towards highresolution, high brightness and low power consumption. However, as theresolution of display panels increases, the number of sub-pixels of adisplay panel also increases for high resolution, thereby increasing themanufacturing cost of the display panels. In order to reduce theproduction cost of the display panels and improve image quality, specialarrangements of sub-pixels cooperating algorithms can be applied todisplay devices to improve the color resolution of the display panels.

Compared to the conventional RGB stripe arrangement used in displays,the tiled-type sub-pixel arrangement has been widely discussed fororganic light-emitting diode (OLED) display applications. By increasingthe area of red sub-pixels and blue sub-pixels, the current density isreduced to extend the life of the red and blue OLEDs due to theirmaterial characteristics, and extend the red and blue light-emittingarea. However, the light-emitting area limits the current density. It istherefore impossible to compensate for the brightness of the red andblue light with a higher current, and the diversity of sub-pixelarrangements is reduced. In addition, conventional liquid-crystaldisplays (LCDs) and organic light-emitting diodes (OLEDs) have a largeaperture ratio, which makes it difficult to conduct maintenance.Therefore, it is still necessary to make improvements in display devicesso that they have a large current density working range, a large varietyof sub-pixel arrangements, and a low aperture ratio, to further improvethe color resolution, enhance image quality, and reduce the difficultyof maintenance.

BRIEF SUMMARY

An embodiment of the present disclosure provides an inorganiclight-emitting diode (LED) display, including a carrier, a plurality ofgreen chips, a plurality of red chips, and a plurality of blue chips.The green chips, the red chips, and the blue chips are periodicallyarranged on the carrier, wherein a number of the green chips is greaterthan a number of the red chips, and the number of the green chips isgreater than a number of the blue chips, and wherein a minimum distanceP_(sub_g) between adjacent ones of the green chips is smaller than aminimum distance P_(sub_r) between adjacent ones of the red chips in afirst direction D1, and the minimum distance P_(sub_g) between adjacentones of the green chips is smaller than a minimum distance P_(sub_b)between adjacent ones of the blue chips in the first direction D1.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure can be more fully understood from thefollowing detailed description when read with the accompanying figures.It should be noted that, in accordance with standard practice in theindustry, various features are not drawn to scale. In fact, thedimensions of the various features may be arbitrarily increased orreduced for clarity of discussion.

FIG. 1 illustrates a cross-sectional view of an inorganic light-emittingdiode (LED) display, according to some embodiments of the presentdisclosure.

FIG. 2 is a schematic view of sub-pixel arrangement structure of aninorganic LED display, according to some embodiments of the presentdisclosure.

FIGS. 3A-3B are schematic views of sub-pixel arrangement structures of aminimal repeating unit in an inorganic LED display, according to someembodiments of the present disclosure.

FIGS. 4A, 4B, 5, 6A, 6B, and 6C are schematic views of sub-pixelarrangement structures of a minimal repeating unit in an inorganic LEDdisplay, according to various embodiments of the present disclosure.

FIGS. 7A, 7B and 7C illustrate image simulations of various structureswith different arrangements of sub-pixels by computers.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, orexamples, for light-emitting devices and methods of forming the same.However, it should be noted that the embodiments of the presentdisclosure provide many concepts of the disclosures that can beimplemented in a wide variety of specific contexts. Specific examples ofcomponents and arrangements are described below to simplify the presentdisclosure. These are, of course, merely examples and are not intendedto be limiting. In addition, the present disclosure may repeat referencenumerals and/or letters in the various examples. This repetition is forthe purpose of simplicity and clarity and does not in itself dictate arelationship between the various embodiments and/or configurationsdiscussed.

The terms “about” and “substantially” typically mean +/−20% of thestated value, more typically +/−10% of the stated value, more typically+/−5% of the stated value, more typically +/−3% of the stated value,more typically +/−2% of the stated value, more typically +/−1% of thestated value and even more typically +/−0.5% of the stated value. Thestated value of the present disclosure is an approximate value. Whenthere is no specific description, the stated value includes the meaningof “about” or “substantially”.

Some embodiments of the present disclosure provide an inorganic LEDdisplay, which includes one or more red inorganic LED chips (alsoreferred to red chip), one or more blue inorganic LED chips (alsoreferred to blue chip), and a number of green inorganic LED chips (alsoreferred to green chip) that is more than that of the red chips and theblue chips. One of the features of the embodiments of the presentdisclosure is that the number of green chips is greater than the numberof red chips, and the number of green chips is greater than the numberof blue chips. Sub-pixels (refer to the smallest unit for displayingimages, such as a green chip) used in current displays are generallyarranged as an RGB stripe with the same number of red, green, and bluechips respectively to form a full pixel. In the display provided by theembodiment of the present disclosure, by increasing the number of greenchips and adjusting the minimum distance between chips of differentcolors, not only the resolution but also the image quality can befurther improved.

FIG. 1 illustrates a cross-sectional view of an inorganic LED displayaccording to an embodiment of the present disclosure. In FIG. 1 , aninorganic LED display 10 includes a carrier 100 and a plurality of LEDchips 102 arranged on the carrier 100 in a two-dimensional array. Forthe sake of brevity, only three LED chips 102 are shown, but the presentdisclosure is not limited thereto. Each LED chip 102 has a firstelectrode 110 a (e.g., a positive electrode) and a second electrode 110b (e.g., a negative electrode). In some embodiments, the polarities ofthe first electrode 110 a and the second electrode 110 b may depend ondifferent types of the LED chips 102. For example, in some embodiments,the first electrode 110 a is a negative electrode, and the secondelectrode 110 b is a positive electrode. The first electrode 110 a andthe second electrode 110 b are disposed on the same side of the LED chip102 facing the carrier 100 (which may also be referred to as the backside of the LED chip 102). For example, in some embodiments, the side ofthe LED chip 102 that is farthest away from the carrier 100 is thelight-emitting side (it may also be referred to as the front side), andthe first electrode 110 a and the second electrode 110 b are disposed onthe opposite side of the light-emitting side of the LED chip 102. Insome embodiments, the carrier 100 may be a printed circuit board (PCB),a thin film transistor glass (TFT glass), a complementary metal oxidesemiconductor (CMOS) carrier, or other suitable materials, but is notlimited thereto. The LED chips 102 include green chips 102 g, red chips102 r, and blue chips 102 b. In some embodiments, the material of theLED chips 102 may include inorganic semiconductor materials, such asIII-V compounds, II-VI compounds, or other suitable materials, but isnot limited thereto. The III-V compounds can be GaN-based material,GaAs-based material, or InP-based material, and the II-VI compounds canbe ZnS-based material or CdSe-based material.

In some embodiments, the material of the first electrode 110 a and thesecond electrode 110 b may be made of metal or a metal alloy. Forexample, the metal materials of the first electrode 110 a and the secondelectrode 110 b may include (but are not limited to) copper (Cu),aluminum (Al), indium (In), tin (Sn), gold (Au), platinum (Pt), zinc(Zn), silver (Ag), titanium (Ti), nickel (Ni) or a combination thereof.

FIG. 2 illustrates a schematic view of sub-pixel arrangement structureof an inorganic LED display 10 shown in FIG. 1 . In FIG. 2 , green chips102 g, red chips 102 r, and blue chips 102 b are arranged periodicallyon the carrier 100. In some embodiments, the LED chips 102 are arrangedextending along a first direction D1 and a second direction D2 which isperpendicular to the first direction D1, as shown in FIG. 2 . Since thehuman eye is more sensitive to the green wavelengths, reducing thedistance between the green chips may effectively improve the human eye'sability to perceive denser sub-pixel information. Therefore, the LEDchips 102 are disposed in such a way that a minimum distance P_(sub_g)between two adjacent green chips 102 g is smaller than a minimumdistance P_(sub_r) between two adjacent red chips 102 r in a firstdirection D1; and the minimum distance P_(sub_g) between two adjacentgreen chips 102 g is smaller than a minimum distance P_(sub_b) betweentwo adjacent blue chips 102 b in the first direction D1. This sub-pixelarrangement may improve color resolution, provide better image qualityusing fewer chips, and reduce the manufacturing cost.

Since the human eye's perception of color images is mainly dominated bythe color sharing mechanism and the visual limit mechanism, the effectsof color sharing and light mixing may be achieved by adjusting theminimum distance between adjacent chips. For example, in order tosatisfy the color sharing mechanism (1) and the visual limit mechanism(2) at the same time:

15 CPD≤min{f(P _(sub_r)),f(P _(sub_b))}≤30 CPD  (1)

30 CPD≤f(P _(sub_g))≤60 CPD  (2)

the minimum distance between adjacent color chips may be adjusted tosatisfy the following relationship (3) to achieve higher colorresolution and better image quality.

$\begin{matrix}{{\frac{1}{2} \times \max\{ {P_{{sub}\_ r},P_{{sub}\_ b}} \}} \geq P_{sub_{g}} \geq {\frac{1}{4} \times \max\{ {P_{{sub}\_ r},P_{{sub}\_ b}} \}}} & (3)\end{matrix}$

CPD (cycles per degree) is the unit of spatial frequency. The spatialfrequency is defined as the number of cycles of black and white stripesthat can be recognized per degree of viewing angle in the field of view,and is related to the stripe spacing and the distance between the humaneye and the display. For example, When the fringe spacing is P and thedistance between the human eye and the display is D, the angularfrequency f can be defined as

${f(P)} = {\frac{1}{\tan^{- 1}( \frac{2P}{D} )}.}$

When the angular frequency f(P) is in the range of 15 CPD˜30 CPD, thecolor sharing mechanism can be achieved. Specifically, in order to makethe red chip 102 r and the blue chip 102 b on the display enable toshare their colors with the surrounding green chips 102 g respectively,the minimum distance P_(sub_r) between the two adjacent red chips 102 rand the minimum distance P_(sub_b) between the two adjacent blue chips102 b may be adjusted in the range of 15 CPD˜30 CPD. In someembodiments, only the smallest angular frequency min{f(P_(sub_r)),f(P_(sub_b))} between the red chips 102 r and the blue chips 102 b isneeded to be considered in the range of 15 CPD˜30 CPD. When the angularfrequency f(P) is in the range of 30 CPD˜60 CPD, the visual limitmechanism can be achieved. Specifically, in order to make the red chip102 r, the blue chip 102 b, and the green chips 102 g on the display toachieve light mixing, the minimum P_(sub_r) of the adjacent two redchips 102 r, the minimum distance P_(sub_b) of the adjacent two bluechips 102 b, and the minimum distance P_(sub_g) of the adjacent twogreen chips 102 g may be adjusted in the range of 30 CPD˜60 CPD. In someembodiments, since the minimum distance P_(sub_g) between two adjacentgreen chips 102 g is the smallest in the first direction D1, only theangular frequency f(P_(sub_g)) of the green chips 102 g is needed to beconsidered in the range of 30 CPD˜60 CPD.

Still referring to FIG. 2 , in some embodiments, a plurality of greenchips 102 g, one red chip 102 r, and one blue chip 102 b constitute aminimal repeating unit 104 (also referred to one point unit). Theminimal repeating unit 104 has a shape of a rectangular, and repeatedlyarranged in two-dimension to constitute an inorganic LED display 10. Itshould be noted that, in other embodiments, the minimal repeating unit104 may have a shape of a rectangle, a triangle, a polygon, a circle,and so on, but the present disclosure is not limited thereto. In eachminimal repeating unit 104, the number G of green chips 102 g is thelargest, that is, the number G of green chips 102 g is greater than thenumber R of red chips 102 r, and the number G of green chips 102 g isgreater than the number B of blue chips 102 b. In some embodiments, thenumber R of red chips 102 r is greater than the number B of blue chips102 b in the minimal repeating unit 104. In some embodiments, the numberR of red chips 102 r is the same as the number B of blue chips 102 b inthe minimal repeating unit 104. Since the ratio of the different colorsLED chips 102 in the minimal repeating unit 104 is no longer 1:1:1(RGB), which is adopted in the conventional arrangement of LED chips,the algorithm is applied in advance to calculate the image depending onthe ratio of the different colors LED chips. Finally, according to thecalculation result, the image information is transmitted to the LEDchips 102 in the minimal repeating unit 104 to display a full image. Insome embodiments, the algorithm may be applied using common subpixelrendering (SPR) techniques.

Continuing to FIG. 2 , in some embodiments, each LED chip 102 in theminimal repeating unit 104 has substantially the same size. For example,LED chips 102 of different colors have substantially the same size intop view. In some embodiments, the minimal repeating unit 104 has a unitarea S_(p), and each green chip 102 g, red chip 102 r, and blue chip 102b has a light-emitting area S_(g), S_(r), S_(b), respectively. In someembodiments, the light-emitting areas of different colors chips are thesame. For example, S_(g)=S_(r)=S_(b), therefore, compared with theconventional OLED which achieves the display function with differentsub-pixel sizes, there is no need to adjust different current densitiescorresponding to different luminous efficiency, so that the lifetime ofeach color sub-pixel is substantially equivalent, which reduces thedifficulties in design.

In some embodiments, an aperture ratio A of the inorganic LED display 10is smaller than 30%, as shown in FIG. 2 . The aperture ratio A isdefined as the ratio of the total light-emitting area of the LED chips102 to the minimal repeating unit 104, and satisfies the followingrelationship:

$\begin{matrix}{A = {\frac{{GS_{g}} + {RS_{r}} + {BS_{b}}}{S_{p}} < {30\%}}} & (4)\end{matrix}$

wherein G, R, and B are the number of green chips 102 g, the number ofred chips 102 r, and the number of blue chips 102 b in the minimalrepeating unit 104, respectively. Compared with the conventional LCDs orOLEDs whose aperture ratio is designed to be 30% to 90%, the presentdisclosure can provide a lower aperture ratio, which is beneficial forthe maintenance for LED chips 102 in the inorganic LED display 10.

FIGS. 3A-3B schematic views of LED chips 102 arrangement structureswithin the minimal repeating unit 104 according to various embodimentsof the present disclosure. Referring to FIG. 3A, the minimal repeatingunit 104 includes a plurality of subunits 106 in some embodiments. Forexample, the minimal repeating unit 104 includes a first subunit 106 aand a second subunit 106 b. The first subunit 106 a (dashed line) iscomposed of part of green chips 102 g, and the second subunit 106 b(dotted line) is composed of the remaining green chips 102 g as well asone red chip 102 r and one blue chip 102 b. In particular, the subunit106 includes a geometric center C1 of a top-view shape of the minimalrepeating unit 104 as shown in FIG. 3A.

In some embodiments, a geometric center C2 of a top-view shape of thefirst subunit 106 a (dashed line) may not overlap with the LED chips 102of the second subunit 106 b (dotted line) as shown in FIG. 3A. In someembodiments, a geometric center C3 of a top-view shape of the secondsubunit 106 b (dotted line) may not overlap with the LED chips 102 ofthe first subunit 106 a (dashed line). In other embodiments, thegeometric center C2 of the top-view shape of the first subunit 106 a(dashed line) may overlap with the LED chips 102 of the second subunit106 b (dotted line), and the geometric center C3 of the top-view shapeof the second subunit 106 b (dotted line) may overlap the LED chips 102of the first subunit 106 a (dashed line) as shown in FIG. 3B. In thiscase, six green chips 102 g constitute a pentagonal first subunit 106 a(dashed line), and one red chip and one blue chip constitute arectangular second subunit 106 b (dotted line). The red chip 102 r andthe blue chip 102 b are evenly distributed around the green chips 102 g,which are more numerous than the red chips 102 r or the blue chips 102 bin the whole display. Compared to embodiments where the geometric centerC2 of the top-view shape of the first subunit 106 a (dashed line) is notoverlapped with the LED chips 102 of the second subunit 106 b (dottedline), as shown in FIG. 3A, the geometric center C2 of the top-viewshape of the first subunit 106 a (dashed line) and the geometric centerC3 of the top-view shape of the second subunit 106 b (dotted line) arerespectively overlapped with the LED chips of the second subunit 106 b(dotted line) and the LED chips of the first subunit 106 a (dashed line)respectively as shown in FIG. 3B. Therefore, the red chip 102 r and theblue chip 102 b may share color with the surrounding green chips 102 gmore uniformly, which may improve image resolution and improve imagequality. It should be noted that the first subunit 106 a and the secondsubunit 106 b have an overlapping area O, and the overlapping area Oinclude the geometric center C2 of the top-view shape of the firstsubunit 106 a, such that not only improve the resolution, but alsoenhance the image quality.

FIGS. 4A-4B illustrate some embodiments in which the ratio of the numberof red chips, green chips and blue chips (RGB) in a minimal repeatingunit 104 is 1:2:1 according to various embodiments of the presentdisclosure. First, referring to FIG. 4A, the minimal repeating unit 104includes 2 green chips, 1 red chip, and 1 blue chip in some embodiments.The two green chips are arranged to constitute a rectangular firstsubunit 106 a (dashed line), and 1 red chip and 1 blue chip are arrangedto constitute a rectangular second subunit 106 b (dotted line). Thefirst subunit 106 a and the second subunit 106 b have an overlappingarea O which includes the geometric center C2 of the top-view shape ofthe first subunit 106 a. Besides, the color resolution is improved,since each red chip has the same distance (L1=L2) to the surroundingadjacent red chips, as shown in FIG. 4A, the red chips 102 r mayuniformly sharing the color with the surrounding green chips 102 g.Hence, the image quality is increased in the first direction D1 and thesecond direction D2 in equal proportions.

Referring to FIG. 4B, the minimal repeating unit 104 includes 4 greenchips, 2 red chips, and 2 blue chips in some embodiments. The four greenchips are arranged to constitute a parallelogram first subunit 106 a(dashed line), and the two red chips and the two blue chips are arrangedto constitute a parallelogram second subunit 106 b (dotted line). Eachred chip has different distances to the surrounding adjacent red chips(L1′≠L2′). Due to the distance difference between in the first directionD1 and in the second direction D2, the image quality in the twodirections is different. By applying the algorithm, the image quality ina single direction can be strengthened and the color resolution can beimproved at the same time.

FIG. 5 illustrates some embodiments in which the ratio of the number ofred chips, green chips, and blue chips (RGB) in a minimal repeating unit104 is 1:3:1 according to various embodiments of the present disclosure.In some embodiments, the minimal repeating unit 104 includes 3 greenchips, 1 red chip, and 1 blue chip. The three green chips are arrangedto constitute a triangular first subunit 106 a (dashed line), and theone red chip and the one blue chip are arranged to constitute arectangular second subunit 106 b (dotted line). The first subunit 106 aand the second subunit 106 b have an overlapping area O which includesthe geometric center C2 of the top-view shape of the first subunit 106a, such that the first subunit 106 a and the second subunit 106 b aresubstantially distributed around the geometric center C1 of the top-viewshape of the minimal repeating unit 104. Hence, the red chip 102 r andthe blue chip 102 b can evenly share color with the surrounding greenchips 102 g as shown in FIG. 5 , so that the color resolution isimproved and the image quality is enhanced at the same time.

In some embodiments, the minimal repeating units 104 may not be adjacentto each other, and may be in a staggered (rows and columns) arrangementin the inorganic LED display 10.

FIGS. 6A-6C illustrate some embodiments in which the ratio of the numberof red chips, green chips and blue chips (RGB) within a minimalrepeating unit 104 is 1:4:1 according to various embodiments of thepresent disclosure. First, referring to FIG. 6A, the minimal repeatingunits 104 may be of a kite shape, and are arranged in a staggered (rowsand columns) manner in the inorganic LED display 10. The minimalrepeating unit 104 includes 4 green chips, 1 red chip, and 1 blue chipin some embodiments. The four green chips are arranged to constitute aquadrilateral first subunit 106 a (dashed line), and the one red chipand the one blue chip are arranged to constitute a rectangular secondsubunit 106 b (dotted line). The first subunit 106 a and the secondsubunit 106 b have an overlapping area O which includes the geometriccenter C2 of the top-view shape of the first subunit 106 a, such thatthe first subunit 106 a and the second subunit 106 b are substantiallydistributed at the geometric center C1 of the top-view shape of theminimal repeating unit 104. Hence, the red chip 102 r and the blue chip102 b can evenly share colors with the surrounding green chips 102 g asshown in FIG. 6A, so that the color resolution is improved and the imagequality is enhanced.

Referring to FIG. 6B, a minimal repeating unit 104 includes 8 greenchips, 2 red chips, and 2 blue chips in some embodiments. Four of theeight green chips are arranged to constitute a rectangular first subunit106 a (dashed line), the two red chips and the two blue chips arearranged to constitute a rectangular second subunit 106 b (dotted line),and the remaining four green chips are arranged to constitute arectangular third subunit 106 c (dash-dotted line). The subunits 106 a,106 b, and 106 c partially overlap as shown in FIG. 6B.

Referring to FIG. 6C, a minimal repeating unit 104 includes 4 greenchips, 1 red chip, and 1 blue chip in some embodiments. The four greenchips are arranged to constitute a rectangular first subunit 106 a(dashed line), and the one red chip and the one blue chip are arrangedto constitute a rectangular second subunit 106 b (dotted line). Thefirst subunit 106 a and the second subunit 106 b are substantiallydistributed at the geometric center C1 of the top-view shape of theminimal repeating unit 104 as shown in FIG. 6C. It should be noted thatthe minimal repeating units 104 are adjacent to each other and arearranged in a staggered (rows and columns) manner in the inorganic LEDdisplay 10.

FIGS. 7A-7C illustrate the difference of the image quality between theembodiment of the present disclosure and the conventional displaydepending on the chip arrangements simulated by computers. FIGS. 7A and7C are images simulating the sub-pixel arrangements in a conventionalRGB stripe by computers. The difference is that the amount of chips inFIG. 7C is twice of that in FIG. 7A. FIG. 7B is a computer simulation ofan image formed by some embodiments of the present disclosure which havesub-pixels with a ratio of red, green and blue chips (RGB) is 1:2:1 (asembodiments in FIG. 4A). Comparing FIG. 7B with FIG. 7A, it can beclearly seen that the resolution in FIG. 7B is higher than that in FIG.7A. By adding one more green chip within the minimal repeating units 104in the embodiment in FIG. 7B of the present disclosure, the resolutionis comparable with that of conventional RGB stripe arrangement (as shownin FIG. 7C) which using double amount of chips, and the image quality isfurther enhanced.

It should be noted that the present disclosure generally describessub-pixel arrangement structures of a display. Other sub-pixelarrangement structure may be used. For example, different types of LEDchips may be used; LED chips with different light-emitting areas may beused, fewer or additional green chips, red chips, and blue chips may beused; and adjusting the relationship between the minimum distancebetween adjacent green chips and the minimum distance between adjacentred chips or blue chips may be used to form an inorganic LED display.

It is understood that the scope of the present disclosure is not limitedto technical solutions formed by a specific combination of the abovetechnical features, but also covers other technical solutions formed byany combination of the above technical features or their equivalents.The above embodiments can be arbitrarily combined to form newembodiments, and all the new embodiments formed by combination arewithin the protection scope of the present disclosure.

The sub-pixels arrangement of displays of the present disclosure candepend on the design requirements of the display, utilizing thecharacteristic that the human eye is more sensitive to the green lightto add extra one or more green chips in the display so as to improve theimage resolution of the display and enhance the image quality. Forexample, the display may be divided into several minimal repeating unitsin a parallel and/or staggered (rows and columns) arrangement. Next, redchips, blue chips and green chips are arranged in each minimal repeatingunit, and the number of green chips is more than that of both red chipsand blue chips. The LED chips in the minimal repeating unit are arrangedin such a way that the green chips are substantially evenly distributedin the minimal repeating unit, and the red and blue chips aresubstantially evenly distributed around the green chips in the display.For example, the minimum repeating unit may include a plurality ofsubunits, and the subunits are roughly divided into two types, the firsttype of subunit and the second type of subunit. The first type ofsubunit includes at least two chips of the same color, such as two ormore green chips, but is not limited thereto. In some embodiments, theremay be a plurality of first-type subunits, for example, two or morefirst-type subunits. The second type of subunit includes at least twochips of different colors, for example, a red chip and a blue chip. Insome embodiments, the second type of subunit may include green chips,for example, a red chip, a blue chip, and two green chips. By arrangingthe green chips in the display and adjusting the minimum distancebetween the adjacent green chips, image resolution can be improved,image quality is enhanced, and the use of chips can be reduced, therebyreducing the manufacturing cost.

The foregoing outlines features of several embodiments so that thoseskilled in the art may better understand the aspects of the presentdisclosure. Those skilled in the art should appreciate that they mayreadily use the present disclosure as a basis for designing or modifyingother processes and structures for carrying out the same purposes and/orachieving the same advantages of the embodiments introduced herein.Those skilled in the art should also realize that such equivalentconstructions do not depart from the spirit and scope of the presentdisclosure, and that they may make various changes, substitutions, andalterations herein without departing from the spirit and scope of thepresent disclosure.

What is claimed is:
 1. An inorganic light-emitting diode (LED) display,comprising: a carrier; and a plurality of green LED chips, a pluralityof red LED chips, and a plurality of blue LED chips periodicallyarranged on the carrier, wherein a number of the green LED chips isgreater than a number of the red LED chips, and the number of the greenLED chips is greater than a number of the blue LED chips, and wherein aminimum distance P_(sub_g) between adjacent ones of the green LED chipsis smaller than a minimum distance P_(sub_r) between adjacent ones ofthe red LED chips in a first direction D1, and the minimum distanceP_(sub_g) between adjacent ones of the green LED chips is smaller than aminimum distance P_(sub_b) between adjacent ones of the blue LED chipsin the first direction D1.
 2. The inorganic LED display of claim 1,wherein the minimum distance P_(sub_g) between adjacent ones of thegreen LED chips, the minimum distance P_(sub_r) between adjacent ones ofthe red LED chips, and the minimum distance P_(sub_b) between adjacentones of the blue LED chips satisfy the following relationship:${\frac{1}{2} \times \max\{ {P_{{sub}\_ r},P_{{sub}\_ b}} \}} \geq P_{sub_{g}} \geq {\frac{1}{4} \times \max{\{ {P_{{sub}\_ r},P_{{sub}\_ b}} \}.}}$3. The inorganic LED display of claim 1, wherein the green LED chips,the red LED chips, and the blue LED chips are periodically arranged toconstitute a plurality of minimal repeating units.
 4. The inorganic LEDdisplay of claim 3, wherein an aperture ratio of each of the minimalrepeating units is smaller than 30%.
 5. The inorganic LED display ofclaim 3, wherein the green LED chips, the red LED chips, and the blueLED chips in each of the minimal repeating units have substantially thesame size.
 6. The inorganic LED display of claim 3, wherein the numberof the green LED chips G, the number of the red LED chips R, and thenumber of the blue LED chips B in each of the minimal repeating unitssatisfy the following relationship:G>R≥B.
 7. The inorganic LED display of claim 3, wherein each of theminimal repeating units comprises a plurality of sub-units, wherein eachof the sub-units is composed of at least two LED chips.
 8. The inorganicLED display of claim 7, wherein two of the sub-units are partiallyoverlapping with each other.
 9. The inorganic LED display of claim 7,wherein in each of the minimal repeating units, one of the sub-unitsincludes only LED chips of the same color.
 10. The inorganic LED displayof claim 1, wherein each of the chips comprises a pair of electrodesdisposed on a side opposite to a light-emitting side of each of the LEDchips.